From 8952a6a9c7dd4e5b41be135cf87882f161254d7d Mon Sep 17 00:00:00 2001
From: treeston <treeston.mmoc@gmail.com>
Date: Thu, 22 Sep 2016 02:57:07 +0200
Subject: [PATCH] Movement/SplineChain: Fix a potential critical bug where
 resume info returned during an edge case could fail an assertion when used.

---
 .../MovementGenerators/SplineChainMovementGenerator.cpp    | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/server/game/Movement/MovementGenerators/SplineChainMovementGenerator.cpp b/src/server/game/Movement/MovementGenerators/SplineChainMovementGenerator.cpp
index 43b4c6b029e..5cc96add7a6 100644
--- a/src/server/game/Movement/MovementGenerators/SplineChainMovementGenerator.cpp
+++ b/src/server/game/Movement/MovementGenerators/SplineChainMovementGenerator.cpp
@@ -135,7 +135,12 @@ SplineChainResumeInfo SplineChainMovementGenerator::GetResumeInfo(Unit const* me
     if (!_nextIndex)
         return SplineChainResumeInfo(_id, &_chain, _walk, 0, 0, _msToNext);
     if (me->movespline->Finalized())
-        return SplineChainResumeInfo(_id, &_chain, _walk, _nextIndex, 0, 1u);
+    {
+        if (_nextIndex < _chainSize)
+            return SplineChainResumeInfo(_id, &_chain, _walk, _nextIndex, 0, 1u);
+        else
+            return SplineChainResumeInfo();
+    }
     return SplineChainResumeInfo(_id, &_chain, _walk, uint8(_nextIndex - 1), uint8(me->movespline->_currentSplineIdx()), _msToNext);
 }